Kinetics of heterogeneous decomposition of hydrogen peroxide with some transition metal complexes supported on silica-alumina in aqueous medium

Silica-alumina in the form of diethylamine (deam)-, dimethylamine (dmam)-, ethylamine (eam)-, ammonia (amm)- and aniline (an) -copper(II) complexes as well as deam-cobalt (II) complex have been used as potentially active catalysts for H 2O 2 decomposition in an aqueous medium. The reaction was first...

Full description

Saved in:
Bibliographic Details
Published in:Journal of molecular catalysis 1993-09, Vol.84 (1), p.67-75
Main Authors: Salem, Ibrahim A., Salem, Mohamed A., Gemeay, Ali H.
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
heterogeneous decomposition
hydrogen peroxide
kinetics
silica-alumina
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Silica-alumina in the form of diethylamine (deam)-, dimethylamine (dmam)-, ethylamine (eam)-, ammonia (amm)- and aniline (an) -copper(II) complexes as well as deam-cobalt (II) complex have been used as potentially active catalysts for H 2O 2 decomposition in an aqueous medium. The reaction was first order with respect to the H 2O 2 concentration and the rate constants (per g of dry silica-alumina) were determined. A coloured compound, a peroxo-metal complex, which formed at the beginning of the reaction in each case, was found to contain the catalytically active species. The activation energy and the change in the entropy of activation increased with the basicity of the ligands in the following order: an < amm < eam < dmam < deam, which is also the probability sequence for the formation of the activated complex. A reaction mechanism was proposed.
ISSN:0304-5102
DOI:10.1016/0304-5102(93)80085-9